Research on Excavation Method for Soft Rock Tunnel Based on Stress Release Rate

被引:3
|
作者
Nie, Jincheng [1 ]
He, Chuan [1 ]
Kou, Hao [1 ]
Liu, Fuhua [1 ]
Yang, Wenbo [1 ]
机构
[1] Southwest Jiaotong Univ, Key Lab Transportat Tunnel Engn, Minist Educ, Chengdu 610031, Peoples R China
来源
APPLIED SCIENCES-BASEL | 2024年 / 14卷 / 02期
关键词
tunnel; model test; double primary support; excavation methods; stress release rate; DEFORMATION CONTROL TECHNOLOGY; TIME;
D O I
10.3390/app14020668
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A test method for controlling the stress release rate of the tunnel by adjusting the confining pressure is proposed based on the engineering background of Dongmachang No. 1 Tunnel of Huali Expressway to explore a suitable excavation method of soft rock tunnel. Based on the relationship between stress release rate, displacement release rate, and longitudinal advance of excavation face, the model test of tunnel excavation is carried out. On this basis, combined with the horizontal loading test and field monitoring results, the influence of three excavation methods, the three-bench method, three-bench with reserved core soil method, and three-bench seven-step method, on the mechanical behavior of the tunnel is studied. The research shows that the load shared by the double-layer initial support is not equal, and the second-layer initial support only bears 20% of the pressure of the first-layer initial support; replacing the three-bench method with the three-bench core soil method and the three-bench seven-step method can reduce the deformation of the surrounding rock by 8.7 similar to 12.4%, and the load borne by the supporting structure is transferred from the second layer to the first layer. In order to take into account the safety and efficiency of tunnel construction, it is recommended to use the three-bench core soil method for excavation. The research results can provide a theoretical reference for the construction of related tunnel projects.
引用
收藏
页数:24
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